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<head>

    <meta charset="UTF-8">

    <meta http-equiv="X-UA-Compatible" content="IE=edge">

    <meta name="viewport" content="width=device-width,  initial-scale=1.0">
    <title>js使用</title>
</head>

<body>
    <a href="javascript:confirm('你正在学习js');">按钮</a>
    <p onclick="javascript:alert('hello  world')">点击</p>
</body>

</html>